Details

Autor(en) / Beteiligte

• Shin, Min Chang
• Kim, Jae Ho
• Nam, Seunghoon
• Oh, Yun Ji
• Jin, Hyoung‐Joon
• Park, Chong Rae
• Zhang, Qiang
• Yang, Seung Jae

Titel

Atomic‐Distributed Coordination State of Metal‐Phenolic Compounds Enabled Low Temperature Graphitization for High‐Performance Multioriented Graphite Anode

Ist Teil von

• Small (Weinheim an der Bergstrasse, Germany), 2020-08, Vol.16 (33), p.e2003104-n/a

Ort / Verlag

Weinheim: Wiley Subscription Services, Inc

Erscheinungsjahr

2020

Quelle

Wiley Online Library

Beschreibungen/Notizen

• Continuous efforts have been made to achieve nanostructured carbon materials with highly ordered graphitic structures using facile synthetic methods. 3D graphite nanoballs (GNBs) are synthesized by the low‐temperature pyrolysis of a non‐graphitizable precursor, tannic acid (TA). Abundant phenol groups on TA bind to Ni2+ to form metal‐phenolic coordination, which renders each Ni cation to be atomically distributed by the TA ligands. Even at low temperatures (1000 °C), highly ordered graphitic structure is promoted by the distributed Ni nanoparticles that act as a graphitization catalyzer. The crystallinity of the GNB is fully corroborated by the intense 2D peak observed in Raman spectroscopy. In particular, the graphitic layers have orientations pointing toward multidirections, which are beneficial for the rapid transport of Li‐ions into graphite grains. The resulting materials exhibit outstanding electrochemical performance (120 mAh g−1 at 5 C and 282 mAh g−1 at 0.5 C after 500 cycles) when evaluated as a fast‐chargeable negative electrode for lithium ion batteries. Low‐temperature pyrolysis of a non‐graphitizable precursor is enabled by the coordination of tannic acid with atomically distributed nickel ion. The resulting 3D graphite nanoballs (GNBs) possess unprecedented nanostructures with multioriented graphite domain. The GNBs exhibit outstanding rate capability and highly stable cycling performance when evaluated as an anode material for lithium ion batteries.